TONE DETECTOR CIRCUIT - Patent 0066624

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EP 0 066 624 A1

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(43)	Date of publication:
	15.12.1982 Bulletin 1982/50

(21)	Application number: 82900456.0

(22)	Date of filing: 17.12.1981

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International Patent Classification (IPC):

H04H 1/ 00^{( . )}
H04B 5/ 00^{( . )}
H04Q 9/ 10^{( . )}

H04L 27/ 00^{( . )}
H04H 20/ 49^{( . )}

(86)	International application number:
	PCT/US1981/001693

(87)	International publication number:
	WO 1982/002304 (08.07.1982 Gazette 1982/17)

(84)	Designated Contracting States:
	CH DE FR GB LI NL SE

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Priority:

22.12.1980 US 19800218878

(71)	Applicant: MOTOROLA, INC.
	Schaumburg, IL 60196 (US)

(72)	Inventor:
	ECKLUND, Lawrence Marvin Wheaton, IL 60187 (US)

(74)	Representative: Ibbotson, Harold
	Motorola European Intellectual Property Midpoint Alencon Link Basingstoke Hampshire RG21 1PL Basingstoke Hampshire RG21 1PL (GB)

(54)	TONE DETECTOR CIRCUIT